Added Gradle to Groovy project.

Groovy/src/test/groovy/com/gildedrose/GildedRoseTest.groovy

@@ -0,0 +1,15 @@
+package com.gildedrose
+
+import org.junit.jupiter.api.Test
+
+class GildedRoseTest {
+
+    @Test
+    void "foo"() {
+        def items = [ new Item("foo", 0, 0) ] as Item[]
+        def app = new GildedRose(items)
+        app.updateQuality()
+        assert "fixme" == app.items[0].name
+    }
+
+}

Groovy/src/test/groovy/com/gildedrose/TexttestFixture.groovy

@@ -0,0 +1,32 @@
+package com.gildedrose
+
+println("OMGHAI!")
+
+Item[] items = [
+        new Item("+5 Dexterity Vest", 10, 20),
+        new Item("Aged Brie", 2, 0),
+        new Item("Elixir of the Mongoose", 5, 7),
+        new Item("Sulfuras, Hand of Ragnaros", 0, 80),
+        new Item("Sulfuras, Hand of Ragnaros", -1, 80),
+        new Item("Backstage passes to a TAFKAL80ETC concert", 15, 20),
+        new Item("Backstage passes to a TAFKAL80ETC concert", 10, 49),
+        new Item("Backstage passes to a TAFKAL80ETC concert", 5, 49),
+        // this conjured item does not work properly yet
+        new Item("Conjured Mana Cake", 3, 6)] as Item[]
+
+GildedRose app = new GildedRose(items)
+
+int days = 2
+if (args.length > 0) {
+    days = Integer.parseInt(args[0]) + 1
+}
+
+for (int i = 0; i < days; i++) {
+    println("-------- day " + i + " --------")
+    println("name, sellIn, quality")
+    for (Item item in items) {
+        println(item)
+    }
+    println ""
+    app.updateQuality()
+}